Bag making machine



Oct. 25, 1938. A. POTDEVIN BAG MAKING MACHINE Filed 001;. 27, 1936 I \Q' ATTO 190mm Porps v/A/ Patented Oct. 25, 1938 UNITED STATES PATENT OFFICE BAG MAKING MACHINE Application October 27, 1936, Serial No. 107,839

7 Claims.

This invention relates to improvements in bag making machines, and has for one of its objects the provision of a machine wherein after the tubing from which the bags are made is divided into bag lengths, the bag lengths in their continued travel in one direction are inverted, i. e., turned upside down to bring the seam side of the bag length on the bottom and turned end for end. This facilitates printing of the bag lengths and bottoming.

Other objects of the present invention will be manifest from the following description and the accompanying drawing, inwhich drawing:

Fig. 1 is a diagrammatic view of my improved machine;

Fig. 2 is an enlarged fragmentary view of the gripping mechanism;

Fig. 3 is a perspective view of a bag length in the position it assumes after the cutting-off operation and before being inverted;

Fig. 4 is a similar view of the bag length after the same has passed the inverting mechanism;

and

. Fig. 5 is a plan view of the machine of Fig. l.

Referring to the drawing in detail, 2 designates a web of material from which the bags are to be made. This material may be paper, gla'ssine, cellophane or the like and is taken from a supply roll (not shown). A stripe of adhesive 4 is applied to one edge of this web by any of the well known methods. The web then passes to tubing mechanism, designated 6. This tubing mechanism may be of the usual construction and functions to bring the pasted edge of the web over upon the other edge of the web to be secured thereto and form a seam 8.

After the tubing operation, the tubing passes between upper pressure rollers l0 and i2 and cooperating lower roller I4. The roller Ill it will be noted overlies the tube seam 8. The peripheries of the rollers l0 and I2 are herringbone. As

the tube passes through the machine the edges thereof are subjected to the pressing action of the rollers Ill and i2 and due to the herringbone for- 5 mation of the faces of these rollers I am assured that the entire face of the web is subjected to pressure, thereby closing the seam throughout its length.

After the seam has been closed the tube passes 50 to the cutting-off mechanism, designated Hi. This mechanism comprises a stationary knife l8 and a movable striker bar 20. The striker bar 20 is carried on sprockets 22 which in turn are carried by sprocket wheels 24 and 26. During the severing operation pinch rollers 28 and It come into operation to hold the web during the severing operation in a well known manner. The severed bag length then moves to forwarding rollers 32 and 34 and presser rollers 36 and 38.

As the bag length continues its movement longitudinally in a forward direction it passes from the rollers 36 and 38 to the mechanism which is to turn it upside down and end for end. This mechanism comprises a rotatable drum 40, stationary cam 42, gripping fingers 44 and 46, pivotally mounted on the drum for rotation therewith, a pinion 48 on the shaft of the gripping fingers, a pivotally mounted arm 50 having a segment 52 at one end and a roller or cam follower 54 at its other end.

A spring 56' is provided for maintaining the cam follower in engagement with the stationary cam 42. As the leading end of the bag length reaches the drum 40 the gripping finger 44, as seen in Fig.

1, will be opened to receive the end of the bag length and on further rotation of the drum the cam follower 54 will ride off the cam 42 under the action of spring 56, thereby pivoting the arm 50 which in turn will move the segment 52 to rotate the pinion and gripping finger to gripping 25 position.

As the drum continues its rotation the bag length will be advanced longitudinally but in a curved path, whereby the bag length will be carried around until the cam follower 54 again en- 30 gages the cam 42, when the arm 50 will again be rocked to rock the segment 52 and cause the finger to open and release the bag length. The drum at that time has only rotated for about half a turn so that the bag length will be free to drop in in- 35 verted position upon a conveyor belt 58 driven by means of a-sprocket 60 carried by sprocket wheels 62 and 64, again to move forward lengthwise and toward the printing mechanism, designated 66. The conveyor belt is provided with stops 68 for 40 engaging the bag length to insure movement of the same with the conveyor belt.

The printing mechanism 66 may be of the usual construction, comprising ink ng rollers 10 and an impression roller 12.

It will be appreciated from'the foregoing that during the inverting operationby the drum 4!! the bag length has been inverted or turned upside down so that the seam side is now on the bottom and as the bag length is fed by the conveyor belt 58 to the printing mechanism 66 the printing impression will be made on the side of the bag opposite to the seam. It will also be appreciated that during the inverting operation the bag length was turned end for end so that what was formerly the trailing end of the bag length is now the leading end.

After the bag length leaves the printing mechanism 66 the same is forwarded to the bottoming drum 80 by means of forwarding rollers 82 and 84.

As will be seen from Figs. 1 and 5, I have provided fingers 86 which are adapted to be operated by a cam 88 through a cam follower 90. The purpose of these fingers is to remove the bag length from the conveyor belt and guide the same toward forwarding rollers 92 and 94 to the printing mechanism 68.

- It is to be understood that while I have illustrated and described one embodiment of my invention I do not wish to be limited to this precise construction as obviously various modifications and changes may be made therein without departing from the spirit and scope of my invention.

What I claim is:- p

l. A machine of the class described, comprising in combination means for forming a traveling web into a tube with a seam in one wall thereof, means for continuously advancing the tube with its seam wall uppermost, severing mechanism for severing the tube into bag lengths, forwarding mechanism for forwarding the bag lengths lengthwise to a printing station, and means in the path of travel of the bag lengths for turning the baglengths end for end and for inverting the bag lengths so as to present the unseamed wall of each bag length to the impression roller of the printing station, bottoming mechanism and means for continuously advancing theprinted bag lengths to said bottoming mechanism.

2. A machine of the class described, comprising in combination tube forming mechanism including means for seaming the tube, means for continuously advancing the tube endwise, means for severing the tube at intervals into bag lengths,

a." forwarding mechanism for-forwarding the bag lengths endwise, a rotating member in the line of travel of said bag lengths, and cam actuated means for gripping the leading end of the bag length and carrying the same around with the rotating member and for releasing the bag length in inverted position, a conveyor belt below said rotating member for receiving the released inverted bag lengths, forwarding rollers for receiving the inverted bag lengths from the conveyor belt, a printing station, receiving the bag lengths from the forwarding rollers, and bottoming mechanism receiving the printed-bag lengths from the printing station. 7

3. A machine of the class described, comprising in combination tube forming mechanism including means for seaming the tube, means for continuously advancing the tube endwise, means for severing the tube at intervals to provide bag lengths, means for continuously advancing said bag lengths endwise, a drum in the line of travel of said bag lengths, cam actuated means for attaching the'leading end of each bag length to the upper side of the drum, means for automatically releasing each bag length before the drum has made a complete revolution thereby to invert the bag lengths and turn them end for end, a conveyor belt directly below said drum for receiving the inverted bag lengths, a printing station, said belt conveying the bag lengths endwise toward said printing station, and cam-controlled means for removing the bag lengths from said conveyor belt.

4. A machine of the class described, comprising in combination tube forming mechanism including means for seaming the tube, means for continuously advancing the tubing endwise, means for severing the tubing at intervals to provide bag lengths, a rotating drum in the line of travel of said bag lengths, a stationary cam, a pivotally mounted arm and a finger carried by said drum, said finger being actuated by said cam through said arm to grip the leading end of the bag lengths and carry the same around with the drum during a partial rotation thereof and then to release the same in inverted position, printing mechanism in the line of travel of said bag lengths, and a conveyor belt directly below said drum for receiving the bag lengths and for conveying the same to said printing mechanism in inverted position.

5. A machine of the class described, comprising in combination tube forming mechanism including means for seaming the tube, means for continuously advancing the tubing endwise, means for severing the tubing atintervals to provide bag lengths, a rotating drum in the line of travel of said bag lengths, a gripping finger pivotally mounted on said drum, a pivotally mounted arm cooperating with said finger, a pinion integral with said finger, a segmental gear carried by said arm and meshing with said pinion, a cam for actuating said arm to open and close said finger, said finger closing on the leading end of each bag length so that the bag length is carried with the drum for a partial revolution and released in inverted position, printing mechanism and means,

for conveying the inverted bag lengths to said printing mechanism.

6. A machine of the class described, comprising in combination tube forming mechanism including means for seaming the tube, means for continuously advancing the tube endwise, means for severing the tubing at intervals to provide bag lengths, a rotating drum in the line of travel of said severed bag lengths, a gripping finger pivotally mounted on said drum, 8. pivotally mounted arm cooperating with said finger, a pinion integral with said finger, a segmental gear carried by said arm and meshing with said pinion, a cam for actuating said arm to open and close said finger, said finger closing on the leading end of said bag lengths, to attach the bag length to the drum for a partial revolution and then to release the same in inverted position, printing mechanism, a conveyor belt directly beneath said drum for receiving said inverted bag lengths and for conveying the same endwise to said printing mechanism, and means for continuously advancing said bag lengths to bottoming mechanism.

'7. The methodwhich comprises tubing a continuously advancing paper web with a seam in its upper wall, dividing the advancing tubed web into bag lengths, effecting endwise movement of the bag lengths and during this endwise movement turning the bag lengths end for end and inverting the same to bring the unseamed wall uppermost, advancing the inverted bag lengths to a printing station to present the unseamed wall to the impression roll of the printing station, and then advancing the printed bag lengths while still in an inverted position to a bottoming station.

ADOLPH POTDEVIN. 

